Performance Testing of Hydraulic Power Transmission Fluids
Southwest Research Institute has extensive experience in the performance testing of hydraulic power transmission fluids. With fully equipped laboratories and an experienced staff of engineers, technicians, and support personnel, Southwest Research Institute:
Denison P46 Test Stand
SwRI employs a high-pressure Denison pump that measures the ability of hydraulic oils to deliver maximum performance as part of the Denison HF-O Standard. Tests determine oil effects on flow, deposits, and wear in a 46-series piston pump. Each test is run at 2,400 rpm for 60 hours at 71 degrees Celsius, followed by 40 hours of operation at 99 degrees Celsius. At 60 hours, the pump is disassembled and inspected for evidence of distress.
Vickers Test Stands
The demand for antiwear hydraulic fluids for use in mobile equipment utilizing high-performance hydraulic pumps is escalating rapidly, and equipment breakdowns are costly. Hydraulic equipment failure can be reduced through the use of fluids that provide good antiwear protection in hydraulic pumps.
Two tests for the qualification of hydraulic oils used in Vickers vane pumps are offered at SwRI:
Sundstrand Dynamic Corrosion Test Stand
The Sundstrand Series 22 axial flow pump, driven by a six-cylinder diesel engine, is a highly specialized system that can determine the ability of hydraulic fluids to maintain rated flow at high pressure in the presence of water. Hydraulic pump efficiency can be degraded by a small amount of water in the hydraulic fluid if it causes dynamic corrosion of yellow metals in the pump. The Sundstrand pump is run at 5,000 psi at an outlet temperature of 82 degrees Celsius for 225 hours, with water added after the first 25 hours. Evaluations include:
For nonstandardized hydraulic fluid or hydraulic hardware investigations, SwRI has developed a universal hydraulic test stand with the following capabilities:
This stand offers state-of-the-art computer data acquisition and control.This brochure was published in October 1999. For more information about performance testing of hydraulic power transmission fluids, contact Michael Lochte, director, Fuels and Driveline Lubricants Research Department, Fuels and Lubricants Research Division, Southwest Research Institute, P.O. Drawer 28510, San Antonio, Texas 78228-0510, Phone (210) 522-5430, Fax (210) 680-7523.